Britney Spears’ boyfriend Sam Asghari is opening up about his weight loss transformation.

Asghari, now 24, spoke to Men’s Health about how he lost close to 100 pounds over a period of just six months.

The makeover began after a depressed 19-year-old Asghari, who weighed 290 pounds, caught a college football game on television back in 2013. It reminded him of his glory days on the field in high school and how fit he was at the time.

“I told the general manager [at Gold’s], ‘I want to be a personal trainer, and learn about the human body and the scientific aspects of it,’ and he said, ‘Sam, whatever makes you happy,’” Asghari reflected.

In order to stick to his strict diet, Asghari gave himself a $50 grocery budget.